A. Spyke Talks
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解题说明:此题只需要统计出现的非0数字的个数,如果为2就加1,超过2就输出-1
#include <iostream>#include <cstdio>#include <cstdlib>#include <cmath>#include <cstring>#include <string>#include <algorithm>using namespace std;int main(){ int n,i,k,temp,j;int a[1003][2];int count;memset(a,0,sizeof(a));scanf("%d",&n);k=0;for(i=0;i<n;i++){scanf("%d",&temp);for(j=0;j<k;j++){if(temp==a[j][0]){a[j][1]++;break;}}if(j==k){a[k][0]=temp;a[k][1]=1;k++;}}count=0;for(i=0;i<k;i++){if(a[i][1]==2&&a[i][0]!=0){count++;}if(a[i][1]>=3&&a[i][0]!=0){count=-1;break;}}printf("%d\n",count);return 0;}
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